Curucuru-wa Chingu-deul: Mujigae Namuui Bimil

The movie takes place between Seasons 1 and 2. The Green Forest Village hosts a festival in celebration of the 1000th anniversary of the large tree growing in the middle of the village. While Curucuru and his friends are helping in the festival, they learned that tree's vitality is due to a legendary item call the Pingya, which gives it Eternal Love and Life. But in the midst of the festival, a bunch of Pirate Hyenas came to the village and stole the legendary item, causing the tree to wilt. Now it's up to Curucuru and his pals to get it back from the pirates, before things can go worse. But amidst the actual troubles they face, the kids also encounter a strange Tiger child, who is connected to the incident.

(Source: Wikipedia)